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Scientists and engineers tend to express their ideas in the form of equations ___.But for the rest of us, a qualitative grasp of scientific concepts is sufficient,and this can be conveyed by words and diagrams , without the use of equations.
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答案：
they need to know the precise values of quantities
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译文:科学家和工程师倾向于用公式阐述观点，因为他们需要知道量的精确值。但对我们其余的人来说，对科学概念有个质的认识就已经足够了，这可以利用文字和图表来表述，大可不必用公式。
